A new discovery made by University of Adelaide PhD student Leanne Redman, who is studying the little-known impact of the menstrual cycle on women's exercise.

Early results of her research show that exercising at the later menstrual phase burns more fat and helps women to feel less tired. Results suggest that exercise performance is improved during the later part of the menstrual cycle; that is, when circulating concentrations of ovarian hormones (oestrogen and progesterone) are high.

At the later menstrual phase, the hormones promote the use of fats as an energy source to support exercise. The use of fat in aerobic activity provides a more efficient delivery of energy, and results in fewer waste products being produced. These waste products normally contribute to fatigue.

Ms Redman's findings are of international interest to sport scientists and physicians involved in prescribing exercise programs to women for sport, fitness or health. There would be clear benefits to women in regard to their fitness programs, as this information takes into account the physiological changes that occur during the menstrual cycle.

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